CN106442823A - VOC (volatile organic compound) analyzer with carrier gas regeneration function - Google Patents
VOC (volatile organic compound) analyzer with carrier gas regeneration function Download PDFInfo
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- CN106442823A CN106442823A CN201610827405.1A CN201610827405A CN106442823A CN 106442823 A CN106442823 A CN 106442823A CN 201610827405 A CN201610827405 A CN 201610827405A CN 106442823 A CN106442823 A CN 106442823A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
- G01N30/64—Electrical detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
- G01N30/08—Preparation using an enricher
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
- G01N30/64—Electrical detectors
- G01N2030/642—Electrical detectors photoionisation detectors
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Abstract
The invention discloses a VOC (volatile organic compound) analyzer with a carrier gas regeneration function and belongs to the technical field of environmental monitoring. The analyzer comprises a sampling system, an analyzing system and a controlling and acquiring system, wherein the sampling system and the analyzing system are connected through a hose or a metal tube, are coupled through a six-way valve and can be switched between a sampling state and an analyzing state; the sampling system and the analyzing system are connected with the controlling and acquiring system through data lines, and the controlling and acquiring system finally realizes sequential control and data acquisition of each component. The analyzer has the advantages that cyclic regeneration and use of carrier gas can be realized, steel cylinder gas and a gas generator are not required to be matched for use, multiple detection modules can be configured to meet multiple detection requirements, the maintenance cost can be greatly reduced, and the online monitoring requirement is met conveniently.
Description
Technical field
The invention belongs to environmental monitoring technology field is and in particular to a kind of volatile organic matter with carrier gas regeneration function
(volatile organic compounds, VOCs) analyzer.
Background technology
With the quickening of China's process of industrialization, atmosphere polluting problem particularly particulate matter leads to the day at gray haze scene increasingly
Weight, has been already known to restrict the important environmental problem of socio-economic development it would be highly desirable to solve from source.Before important particulate matter
, due to its high reaction activity, and its there is atmospheric photochemistry with oxidant present in air in the situation of illumination in body thing VOCs
Reaction, thus generating fine particle, increasing On The Deterioration of Visibility Over further, promoting the generation of gray haze phenomenon.Wave therefore, it is possible to be directed to
The property sent out organic matter carries out on-line monitoring, and the forecast being formed for gray haze and further investigation have great importance.
The volatile organic matter in-line analyzer of main flow is also less in the market, and main principle is based on chromatogram (Gas
Chromatography, GC) combine corresponding detector, including flame ionization detector (Flame ionization
Detector, FID), photoionization detector (Photo ionization detector, PID) and mass detector
(mass spectrometry, MS) etc..But it is required for using auxiliary gas, such as GC-FID needs in detection process
Using carrier gas (generally high pure nitrogen), combustion-supporting gas (generally zero point air) and hydrogen.GC-PID then needs in detection process
Carrier gas (generally zero point air) to be used.GC-MS similarly needs to provide carrier gas just can complete to detect.And carry in test process
For the mode of above-mentioned gas, mainly there are two kinds：It is respectively and adopt external gas cylinder (such as hydrogen cylinder, nitrogen cylinder etc.) or supporting make
Use gas generator.But the use of this kind of gas just brings larger operation cost and later stage for analyzer longtime running
The inconvenience safeguarded.Also it is that using online of analytical instrument brings inconvenience simultaneously.
Content of the invention
It is an object of the invention to provide a kind of volatile organic matter analyzer with carrier gas regeneration function, do not require the use of
External gas cylinder and gas generator.Based on chromatographic separation technology, multiple detectors can be connected, including photoionization detector
(expansible connection ion mobility spectrometry and all kinds of spectroscopic detector), thus realize (dividing by changing for volatile organic matter
Analysis system, can also be for toxic and harmful) it is analyzed, pass through in the integrated enriching apparatus of sample introduction part simultaneously, can increase
Sample size, the further sensitivity improving analyzer, stability and reappearance.
The present invention adopts chromatographic isolation to combine photoionization detector (also expansible connection ion mobility spectrometry and all kinds of light
Analysis of spectrum module), including：Sampling system, analysis system and control acquisition system.Sampling system pass through flexible pipe or metal tube with
Analysis system connects, and passes through six-way valve 3 and forms coupling, and can cut between sample states and analysis state between two systems
Change.Sampling system and analysis system are passed through data wire again and are connected with control acquisition system, control acquisition system finally to realize each
The SECO data collection of part.
Described sampling system includes：Sampling pipe 1, filter 2, six-way valve 3, quantitative loop 4, enrichment module 5, flowmeter 6,
Sampling pump 7.All connected by flexible pipe or metal tube successively between above-mentioned part.Sampling system is mainly used in realizing for analysis
The quantitative sampling of object and enrichment, further by the switching of stream after the completion of sampling, realization sampling is cut with analytical model
Change.
Described analysis system includes：Six-way valve 3, chromatographic column 8, chromatogram temperature control module 9, detection module 10, detection temperature control
Module 11, circulating pump 12, balance threeway 13, balance carrier gas bag 14, cleaning module 15, filter 16, flow controller 17.Six lead to
Pass through flexible pipe between valve 3, chromatographic column 8, detection module 10 or metal tube connects, detection module 10 passes through flexible pipe or metal tube
Connect circulating pump 12 and balance threeway 13.Balance threeway 13 is passed through flexible pipe and is connected with balance airbag 14.Balance threeway 13 and circulation
Pump 12 passes through flexible pipe or metal tube is connected with cleaning module 15.Cleaning module 15, filter 16, flow controller 17, six lead to
It is sequentially connected by flexible pipe or metal tube between valve 3, ultimately form the stream of closed loop again.Chromatogram temperature control module 9 and detection
Inside device temperature control module 11, there is cavity, by being wrapped in internal airtight cavity chromatographic column 8 and detection module 10
Row heating and cooling, are entered the stability contorting of trip temperature by acquisition control system.This system mainly object to be measured is carried out separate and
Detection, test substance, when by cleaning module, can be removed by material after simultaneously analyzing completely, it is achieved thereby that carrier gas
Regeneration, the carrier gas of regeneration can continue on for the analysis of follow-up process.
Described control acquisition system includes：Control board, industrial PC and intelligent control software.Intelligence software is pacified
It is loaded in industrial PC, industrial PC is connected with control board by data wire and realizes the exchange of signal, control board
It is connected with each part in acquisition system and analysis system by data wire further.Intelligent control software as needed, is realized
The collection of the SECO data of whole system.This system runs intelligent control software by industrial PC, realizes each several part
Collaborative work and feedback control (include flow controls, temperature control etc.), the SECO of analysis process and for analyzing
The functions such as the collection of result, process and storage.
The beneficial effects of the present invention is：
1st, present invention employs the design of carrier gas cleaning module, be continuing with after carrier gas can be purified after analyzing every time,
And without using steel cylinder gas and gas generator, greatly reduce later maintenance and the operating cost of instrument.The load purifying
Gas constantly can rinse detection module, can effectively reduce ambient noise, improves the detection performance of analyzer.And also prevent
Environmental gas are directly entered the possibility of analysis process, reduce environmental gas pollution that may be present, it is possible to increase analyzer
The performance that on-line monitoring uses；
2nd, present invention employs the sample mode that quantitative loop and enrichment module combine, by configuring different quantitative loop,
The dynamic detection range (ppt-ppm) of analyzer can easily be adjusted.It is capable of to be measured further combined with enrichment module
The enrichment of material, thus greatly reducing detection limit, improves sensitivity；
3rd, present invention employs chromatographic isolation module, be that the analysis of subsequent detection system is provided previously by separation function, can
Interference between exclusion material, thus improve the resolution ratio of analyzer；
4th, chromatogram temperature control module in the present invention, surrounds mode for complete, is to replace with electric cooling piece by heater strip to surround color
Spectrum post, be capable of chromatographic column be rapidly heated and the programme-control lowered the temperature such that it is able to adapt to wide boiling range volatile organic matter and
The quick analysis of semi-volatile organic matter.
5th, in the present invention, detector module is configured with temperature regulating device, can greatly reduce the temperature change of detection zone,
Improve the baseline stability of test signal, improve analysis precision；
5th, the detection modules in the present invention can mate different detection techniques, including but be not limited only to photoionization
Detector, ion mobility spectrometry and all kinds of spectrum.By using different enrichments and detection technique, can constantly extend point
The substance classes of analysis are such that it is able to realize the analysis of the many kinds of substance in addition to volatile organic matter, such as hydrogen chloride, hydrogen fluoride
Etc. analysis and some heavy metals of poisonous and harmful substance, including element mercury, metal hydride and organo-metallic compound
Analysis.
Brief description
Fig. 1 is a kind of volatile organic matter analyzer schematic diagram (sample states) with carrier gas regeneration function of the present invention.
Fig. 2 is a kind of volatile organic matter analyzer schematic diagram (analysis state) with carrier gas regeneration function of the present invention.
In figure, sampling pipe 1, filter 2, six-way valve 3, quantitative loop 4, enrichment module 5, flowmeter 6, sampling pump 7, chromatographic column
8th, chromatographic column temperature control module 9, detection module 10, detection module temperature control module 11, circulating pump 12, balance threeway 13, balance carrier gas
Bag 14, cleaning module 15, filter 16, flow controller 17.
Specific embodiment
Below in conjunction with the accompanying drawings, the specific embodiment of the present invention is described in further detail.
The present invention is a kind of volatile organic matter analyzer with carrier gas regeneration function.Using chromatographic isolation combine light from
Sonization detector (also expansible connection ion mobility spectrometry and all kinds of spectral analysis module), this analyzer includes：Sampling system,
Analysis system and control acquisition system.
When six-way valve 3 is in sample states, as shown in figure 1, sampling pipe 1 is connected it is ensured that entering with filter 2 by flexible pipe
The gas entering analyzer does not have particulate matter, prevents blocking pipeline.Between filter 2, quantitative loop 4, flowmeter 6 and six-way valve 3 all
Connected by metal tube or flexible pipe, be connected by flexible pipe between sampling pump 7 and flowmeter 6.By the extraction of sampling pump 7, energy
Enough testing sample is circulated whole sample lines.When needing determinand is enriched with, enrichment module 5 can be in low-temperature condition
(or replacing quantitative loop using adsorption tube), in enrichment process, flowmeter 6 can record sampling volume.
Analysis system is mainly realized object to be measured being separated and being detected, the carrier gas after simultaneously analyzing is by purifying mould
During block, the materials such as test substance and moisture can be removed completely, it is achieved thereby that the regeneration of carrier gas, after regeneration, carrier gas be dried
The analysis of next flow process can be continued on for.
When six-way valve 3 is in sample states, detection module 10 is closed.But run by circulating pump 12,
Carrier gas is constantly passed through cleaning module 15 and filter 16, can constantly clean whole analysis of pipeline it is ensured that subsequent detection
During there is clean background.Flow controller 17 is mainly used in controlling the flow in whole analysis circuit, and emphasis guarantees to demonstrate,prove color
In spectrum post, flow stablizes.Chromatographic column temperature control module 9 passes through uniformly to wrap up heater strip and electricity refrigeration using in chromatographic column 8 surrounding
The mode of paster, enables there is quick heating and cooling function, it is possible to achieve the programme controlled liter of chromatographic column 8 is gently fast
Prompt drop temperature function, is easy to optimize analysis condition, shortens analytical cycle.Gas circuit in analysis, by balancing threeway 13 (balance threeway
The one end being connected with balance airbag 14 may be designed as one-way air inlet function) it is connected with balance carrier gas bag 14, for balancing in gas circuit
Gas gross buffering adjust.If carrier gas is air, do not need to connect balance airbag 14, now balance airbag 14 is by one
Individual filter substitutes, and can obtain carrier gas by direct purification surrounding air.
When six-way valve 3 is in analysis state, as shown in Figure 2.Enrichment module 5 temperature controllable raises, and makes test substance
Heating release, carrier gas can be brought test substance into analysis system and be entered chromatographic column 8, and now chromatographic column temperature module 9 can be according to setting
Good program is heated up or is lowered the temperature.Detection module 10 activates, and the carrying out of the material order after being separated according to chromatographic column 8 detects.
Material after detection out passes through circulating pump 12 afterwards from detection module 10, flows through cleaning module 15, after filter 16, completes carrier gas
Regeneration, finish analysis process simultaneously.The flow of whole analysis circuit is adjusted by flow controller 17 according to setting.Subsequently,
Six-way valve 3 switches to sample states again.
Above-mentioned all during the collection of each unit status and feedback control, the collection of detection module analysis result, calculating
Process and store, realized by the communication of intelligence software and corresponding control board by industrial PC.
Claims (4)
1. a kind of volatile organic matter analyzer with carrier gas regeneration function is it is characterised in that include：Sampling system, analysis
System and control acquisition system；Sampling system passes through flexible pipe or metal tube is connected with analysis system, passes through between two systems
Six-way valve (3) forms coupling, and can switch between sample states and analysis state；Sampling system and analysis system are passed through again
Data wire is connected with controlling acquisition system, controls acquisition system finally to realize the SECO data collection of all parts；
Sampling system is used for realizing the sampling quantitative for analysis object and enrichment, further passes through stream after the completion of sampling
Switching, realizes sampling and the switching of analytical model；
Analysis system is separated to object to be measured and is detected, the material after simultaneously analyzing, will when by cleaning module
Test substance removes completely, it is achieved thereby that the regeneration of carrier gas, the carrier gas of regeneration can continue on for the analysis of follow-up process；
Control acquisition system to run intelligent control software by industrial PC, realize collaborative work and the feedback control of each several part
(including flow control, temperature control etc.), the SECO of analysis process and collection, process and storage for analysis result
Etc. function.
2. the volatile organic matter analyzer with carrier gas regeneration function according to claim 1 is it is characterised in that described
Sampling system include：Sampling pipe (1), filter (2), six-way valve (3), quantitative loop (4), enrichment module (5), flowmeter (6),
Sampling pump (7)；All it is sequentially connected by flexible pipe or metal tube between above-mentioned part.
3. the volatile organic matter analyzer with carrier gas regeneration function according to claim 1 is it is characterised in that described
Analysis system include：Six-way valve (3), chromatographic column (8), chromatogram temperature control module (9), detection module (10), detection temperature control module
(11), circulating pump (12), balance threeway (13), balance carrier gas bag (14), cleaning module (15), filter (16), flow control
Device (17)；Pass through flexible pipe between six-way valve (3), chromatographic column (8), detection module (10) or metal tube connects, detection module
(10) pass through flexible pipe or metal tube connects circulating pump (12) and balance threeway (13)；Balance threeway (13) passes through flexible pipe and balance
Airbag (14) connects；Balance threeway (13) passes through flexible pipe with circulating pump (12) or metal tube is connected with cleaning module (15)；Only
Change module (15), filter (16), flow controller (17), pass through flexible pipe again between six-way valve (3) or metal tube connects successively
Connect, ultimately form the stream of closed loop；Inside chromatogram temperature control module (9) and detector temperature control module (11), there is cavity, pass through
Chromatographic column (8) and detection module (10) are wrapped in internal airtight cavity and are heated and cool down, by acquisition control system
Unite into the stability contorting of trip temperature.
4. the volatile organic matter analyzer with carrier gas regeneration function according to claim 1 is it is characterised in that described
Control acquisition system include：Control board, industrial PC and intelligent control software；Intelligence software is installed on industrial PC
In, industrial PC is connected with control board by data wire and realizes the exchange of signal, and control board passes through number further
It is connected with each part in acquisition system and analysis system according to line；Intelligent control software as needed, realize whole system when
Sequence controls the collection of data.
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| CN201610827405.1A CN106442823A (en) | 2016-09-14 | 2016-09-14 | VOC (volatile organic compound) analyzer with carrier gas regeneration function |
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Cited By (7)
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| CN109060998A (en) * | 2018-09-12 | 2018-12-21 | 中国科学院电子学研究所 | Portable detector and its detection method |
| CN109342132A (en) * | 2018-11-16 | 2019-02-15 | 北京雪迪龙科技股份有限公司 | Mercury enrichment unit and enrichment method, mercury detection system and detection method |
| CN109991042A (en) * | 2019-04-18 | 2019-07-09 | 国珍健康科技（北京）有限公司 | A kind of volatile organic matter multistage enriching apparatus and method |
| CN110361466A (en) * | 2019-06-28 | 2019-10-22 | 南京霍普斯科技有限公司 | Volatile organic contaminant on-line monitoring system and monitoring method in surrounding air |
| WO2021128097A1 (en) * | 2019-12-25 | 2021-07-01 | 广州禾信仪器股份有限公司 | Vocs traceability detection device, system and method |
| CN113092568A (en) * | 2021-03-22 | 2021-07-09 | 西北大学 | Real-time online ion mobility spectrometry monitoring device and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732303A (en) * | 2018-03-15 | 2018-11-02 | 南京白云环境科技集团股份有限公司 | A kind of escaping gas detecting system of rapid broad spectrum |
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| CN110361466A (en) * | 2019-06-28 | 2019-10-22 | 南京霍普斯科技有限公司 | Volatile organic contaminant on-line monitoring system and monitoring method in surrounding air |
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| CN113092568A (en) * | 2021-03-22 | 2021-07-09 | 西北大学 | Real-time online ion mobility spectrometry monitoring device and method |
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Address after: No. 13, sorghum Bridge, Beijing, Beijing, Haidian District Applicant after: The detection technology of NCS Limited by Share Ltd Address before: No. 13, sorghum Bridge, Beijing, Beijing, Haidian District Applicant before: NCS Testing Technology Co., Ltd. |
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